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AT29C512 Datasheet(PDF) 11 Page - ATMEL Corporation

Part No. AT29C512
Description  512K 64K x 8 5-volt Only CMOS Flash Memory
Download  12 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT29C512 Datasheet(HTML) 11 Page - ATMEL Corporation

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11
0456H–FLASH–2/05
AT29C512
18. Software Data Protection
Enable Algorithm(1)
Notes:
1. Data Format: I/O7 - I/O0 (Hex);Address Format: A14
- A0 (Hex).
2. Data Protect state will be activated at end of program
cycle.
3. Data Protect state will be deactivated at end of pro-
gram period.
4. 128 bytes of data MUST BE loaded.
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA A0
TO
ADDRESS 5555
LOAD DATA
TO
PAGE (128 BYTES)(4)
WRITES ENABLED
ENTER DATA
PROTECT STATE(2)
19. Software Data Protection
Disable Algorithm(1)
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 80
TO
ADDRESS 5555
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 20
TO
ADDRESS 5555
LOAD DATA
TO
PAGE (128 BYTES)(4)
EXIT DATA
PROTECT STATE(3)
20. Software Protected Program Cycle Waveform
(1)(2)(3)
Notes:
1. A7 through A15 must specify the page address during each high-to-low transition of WE (or CE) after the software code has
been entered.
2. OE must be high when WE and CE are both low.
3. All bytes that are not loaded within the sector being programmed will be indeterminate.
OE
(1)
CE
WE
DATA
(3)
BYTE 0
BYTE 126
BYTE 127
t
DH
t
BLC
t
DS
t
WP
t
WPH
t
AH
A0-A6
A7-A15
(2)
t
WC
5555
2AAA
5555
AA
55
A0
t
AS
SECTOR ADDRESS
BYTE ADDRESS


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